#include <wfr/common/wfs/WorkflowTemplate.h>
#include <wfr/common/wfs/Workflow.h>
#include <wfr/common/wfs/ActivityTemplate.h>
#include <wfr/WorkflowRuntime.h>
#include <boost/format.hpp>

namespace wfr {
namespace wfs {


WorkflowTemplate::WorkflowTemplate( const std::string& name,
								    wfr_id_t topLevelActivityID,
								    std::initializer_list<ActivityTemplate*> activities)
		: activities(activities), workflowName(name), topLevelActivityID(topLevelActivityID) {
	if (activities.size() == 0) {
		throw exception::wfr_fatal_error((boost::format("Workflow \"%1%\" has no activities.") % workflowName).str());
	}
	for (auto i : activities) {
		i->initActivityTemplate(*this);
	}
	toplevelActivity = getActivityByID(topLevelActivityID);
	if (!toplevelActivity) {
		throw exception::wfr_fatal_error((boost::format("Workflow \"%1%\" has invalid top-level activity id %2%.") % workflowName % topLevelActivityID).str());
	}
	checkStructure();
}


WorkflowTemplate::~WorkflowTemplate() noexcept {
	for (auto i : activities) {
		if (i) delete i;
	}
	activities.clear();
}


ActivityTemplate* WorkflowTemplate::getActivityByID(wfr_id_t id) const noexcept {
	ActivityTemplate* retval = nullptr;
	for (auto i : activities) {
		if (i->templateID == id) {
			retval = i;
			break;
		}
	}
	return retval;
}


void WorkflowTemplate::checkStructure() {
	for (auto i : activities) {
		i->checkStructure();
	}
}


std::shared_ptr<Workflow> WorkflowTemplate::execute(lwd::_wfr_lwd* input, lwd::_wfr_lwd* output) {
	std::shared_ptr<Workflow> wf = std::shared_ptr<Workflow>(new Workflow(*this));
	WorkflowRuntime::addWorkflowInstance(wf);
	try {
		wf->executeSync(input, output);
	} catch (std::exception& e) {
		std::cerr << "Error while executing workflow: Caught exception: " << e.what() << std::endl;
	} catch (...) {
		std::cerr << "Error while executing workflow: Caught unknown exception." << std::endl;
	}
	return wf;
}


} /* namespace wfs */
} /* namespace wfr */